DATE:
July 17, 2024
03
TO:
Board of Supervisors
SUBJECT
Title
AUTHORIZATION TO ADVERTISE AND AWARD A CONSTRUCTION CONTRACT FOR SUNSET AVENUE RETAINING WALL PROJECT AND RELATED CEQA DOCUMENT (DISTRICT: 4)
Body
OVERVIEW
The County of San Diego's (County) Department of Public Works (DPW) maintains nearly 2,000 centerline miles of roads in unincorporated San Diego County. Centerline miles represent the total length of the roads regardless of the number of lanes or the overall roadway width. County roads traverse a variety of regions and conditions, from two-lane roads in mountainous terrain to multi-lane roads in dense population centers. All County-maintained roads are regularly evaluated for safety measures to protect the public. Typical safety measures include traffic signals, roadway signage, and guardrails; but on occasion, other more specialized safety measures, such as retaining walls and similar structures are required to prevent erosion and slope failure.
Sunset Avenue is a County maintained road located in unincorporated La Mesa along Mt. Helix. The location of the improvements along Sunset Avenue are on a section of one-way roadway between the intersections of Fuerte Drive and Summit Circle for a distance of about 0.17-miles. The proposed project will construct a retaining wall to support the roadway in place of the existing foundation constructed from stacked, unreinforced rock structure. The existing foundation is subject to erosion and seismic failure. The proposed improvements will construct a retaining structure known as a soldier pile wall. Soldier pile walls are predominantly used where there is a sudden change in elevation, such as steep embankments to prevent the lateral movement of soil and will provide a strong foundation for the roadway.
The repair work will be to remove and replace about 100 linear feet of the existing roadway to allow the installation of soldier piles and associated lagging panels. The roadway will be resurfa...
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